2. As Balr14 has said, there's some desirable goodies in the second one, but do you really want them? For instance, the Futaba 401 gyro is reputed to be one of the best, but I'm happy with my Align gyro which comes, with associated digital servo, for half the price of the Futaba 401 without servo.

3. Maybe you'll want a "better" or more-current transmitter. The Futaba 10C 2.4GHz, for example, is available in the UK for about £350 or less.

4. If you haven't already got a transmitter, charger, etc., are you new to heli (or any kind of model) flying? If so, you'll need some expert help to fly a T-Rex 500 or any other kind of ccpm heli.